<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>DOM&BOM</title>
	<script type="text/javascript">
		function getFocus(){
			getElementById("btn").focus();
		}
		function lostFocus(){
			getElementById("btn").lostFocus();
		}
	</script>
</head>
<body>
	<input type="text" id="btn" />
	<input type="text" id="bsafdtn" />
	<input type="button"  onclick="getFocus()" value="获取焦点"/>
	<input type="button" onclick="lostFocus()" value="失去焦点"/>
</body>
</html>